[Gpz 1100]

I have a Gpz 1100 all stock and it sat for years and only has 4500 miles on it. Tore down carbs and replaced float needles and went threw all carbs and cleaned. So bike idles and there is no mid range it falls on its face and if you roll throttle easy it’s ok. I’ll put new plugs in and run around the block and they are black. Running rich. ????? Needle is stock and can’t move clip. Jet is stock smallest they have. Compression is same across the board. All plugs are black across the board. Any ideas I’m pulling my hair out with this bike. Please help

 

[Gpz 1100]

I have adjusted floats to 18.5 mm book specs. Float needles seated no leaks. And replaced with oem float needles. Checked all floats for leaks and are good. Checked all passages and went threw all jet holes cleaned. Replaced new air filter and cleaned box.

 

[Gpz 1100]

No blockage to air/fuel jets.

 

[Gpz 1100]

Put timing light to ignition wires and ride and light fires at all times. So ignition is not cutting out.

 

[Gpz 1100]

Adjusted air/fuel needle in to lean out and can not get to lean out. Its a fuel screw on this not air screw. Bike idles fine. Blip the throttle it’s good. Go to crack open to 1/4 to half throttle and falls on its face. If I go threw slow it will tach up and no issues. I was thinking of going to a stage one kit so I can adjust clips on needle? Can I adjust floats to lean out the carbs?? If spec is 18.5 do I adjust to like a 17.5 mm. Or is this just for idle purposes?? I’m not a bike tech but do understand the mechanics

 

[Gpz 1100]

I’m lost lol

 

[Gpz 1100]

Thanks every one for your posts. As of now the bike is 100 percent stock other then aid filter which is a foam filter. Not oem. I’ve set floats as to where bike idles and I can run threw gears with no issues. If I get on throttle about mid way hard it falls on its face. I have had these carbs off 25x or more and went threw each one very precise on float settings to each and every passage. I ride for a few minutes and bring back and check plugs. All are black. Sandblast each plug again and same thing. Changed plugs same issue. I can not get the plugs to clean up. I drew in air/fuel stew and no change on idle. So that tells me carb is rich. All stock jets mains exhaust . It only has 4500 miles on it. All 4 carbs the same. Bike will idle high at times and crack throttle n will at times take a sec to idle. Checked for any vacuum leaks and none. I have been threw this bike from top to bottom. I checked ignition with timing light why riding to see if cuts out in mid range and light stats on. Does not cut out. Really fed up. It’s 500 to a grand to have them done which I think I can do. Just cannot figure it out.

 

[Gpz 1100]

Thank you for all your help. And I still trying to get this bike rite. So this is where I’m at now ... carbs were in bad shape and found when I cleaned . Let me say that only lower part of bowl was bad in the carbs. So what I found was when I cleaned carbs I ended up drilling pilot jet out this making it rich at idle. So I picked up new ones and installed. Went over every hole in each carb again. So I start bike and low and behold it will only fun on choke...wtf!!!!!!! Frustrated. All passages open n clean. Before when pilot jet was drilled it idled just ran rich. Now put new ones will not idle l. Has to be choked to run. And yes it’s the pilot issue. I have pulled back apart went threw again and same ****... I’m at my wits end. The bike is 100 percent stock. 4500 miles on it. I’ve ran it up down the street on old pilots ran strong idled just fouled plugs.... FRUSTRATED. Any help would be greatly appreciated.

 

[Gpz 1100]

Update. Now bike idles. But when I adjust idle it won’t go above 1200 rpm starts to die out. At idle if I ease on throttle dies out completely.

 

[Gpz 1100]

It is a 1996 Gpz 1100. I had carbs sonic dipped. I have sprayed every port and all have good flow. I blow with air all have good flow. I can get bike to idle but it’s only to a certain point I try to raise idle it dies out at 1300 rpm. Before it was running super rich on stock pilot I tryed to clean with wire but I have real small hand drill bits and drilled to big causing rich condition. ( my mistake) now I bought stock ones. Now bike idles before and ran 95 percent but fouled plugs. (Drilled pilots). Now did not change anything and put new pilots in and bike will idle but dies off twisting throttle. I can choke a lil bit it will come up. ( yes lean condition I know) . Checked all passages hundred times . Great flow. I use to re do bikes years ago but haven’t done in a long time but it comes back. Air/fuel screws which I have a fuel screw is at 2 1/2 turns out on all 4 carbs. I plugged all vac ports also.

 

[Gpz 1100]

I’ve completely tore each carb completely apart.

 

[Gpz 1100]

I have removed intire air box and cleaned and replaced air filter. Absolutely no vacuum leaks. Compression is straight across the boards. Just a thought could the jets I just got which are stock 35 could they be smaller causing bike to be lean at idle ? I checked ignition and all good. I rode the bike when old jets in which I accidentally drilled due to blockage and bike idles with them but not the new ones I bought with the smaller hole in the pilot.

 

[Gpz 1100]

I have brand new plugs in it.

 

[Gpz 1100]

Float level will not have a effect on idle circuit? Sense changed to new pilot jets it willl only idle. Soon as you pull throttle instant stall.

 

[Gpz 1100]

Yes checked all air tubes clear. I adjusted floats at it lowest point. Being as lean is I could get. 16.5 mm. Then went to 18.5 mm and both adjustments were the same. I checked all four small holes in front of butterfly. All clear. Blew out all holes and Ali with carb cleaner.